JP2000225185A - First aid adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a first aid adhesive tape which is excellent in water resistance, folding part adhesion, leaving adhesive prevention, and non-stimulation on skin and has improved tack feeling on adhering and little pain on peeling. SOLUTION: An adhesive layer containing an organosiloxane-based polymer and an acrylate-based polymer formed of copolymer of methacrylate ester and functional monomer at a weight ratio of 5:95-19:81 or 5:95-14:86 is equipped on one side of a support and a liquid absorbing pad is mounted on the central area of the surface. The adhesive layer has a microlayer separation structure. It is preferable to use a film of polyester-based polyurethane or polyether-based polyurethane as the support.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an emergency bandage. Specifically, the present invention relates to an emergency bandage which is provided with a liquid absorbing pad or the like in advance and is used by being attached to a skin surface for protection of a wound or the like.

[0002]

2. Description of the Related Art Emergency adhesive plasters are generally constructed by adhering a liquid absorbing pad such as a gauze to an adhesive layer of an adhesive sheet for applying to the skin. The pressure-sensitive adhesive sheet for application to the skin used as a base layer of this first-aid adhesive plaster usually has a pressure-sensitive adhesive layer for application to the skin provided on one side of a support such as a plastic film or a cloth. Since this first-aid bandage is used by directly attaching an adhesive layer to the skin surface, it is required to have excellent adhesiveness to the skin surface and non-irritating property to the skin surface. These required characteristics are extremely important when sticking for a long time. In particular, in the case of emergency bandages, even when applied to bent parts such as finger joints and knee joints, maintenance of skin adhesiveness, impartment of water resistance so that it does not fall off even when performing water work or bathing, peeling Characteristics such as painlessness at the time and no adhesive remaining on the skin surface after peeling are required.

In order to satisfy such required characteristics,
As a substitute material for a support such as polyvinyl chloride which has been widely used in the past, a material using a melt blown nonwoven fabric or a polyolefin has been proposed. These are approaches to solving the above problems from the viewpoint of the support base material used, and impart flexibility and flexibility to the pressure-sensitive adhesive sheet for applying to the skin, thereby improving skin adhesion, skin following properties, and skin non-performance. This is a good attempt at irritation.

[0004] However, such an adhesive tape for application to the skin comes into contact with the skin surface with an adhesive, and thus, the selection of a support alone cannot achieve a sufficient solution. Therefore, the inventors of the present application attempted an approach from an adhesive in order to achieve a direct solution, and
JP-A-206369 proposes an adhesive tape for application to the skin (skin application material) using an adhesive containing an organosiloxane polymer and an acrylic polymer containing alkyl (meth) acrylate as a main component in a certain ratio. ing.

It has been found that the pressure-sensitive adhesive tape for skin application has excellent properties such as water-resistant adhesiveness, adhesiveness at bent portions, adhesive residue prevention, and skin non-irritating properties.

[0006]

However, depending on where the skin is weak, for example, on the part to which it is attached, such as the inside of the upper arm,
In some cases, it was felt painful at the time of peeling, and in actual use, some felt that the tackiness of the pressure-sensitive adhesive surface layer before use was slightly insufficient. Thus, in the above-mentioned pressure-sensitive adhesive tape for skin application, it was excellent in physical properties such as water resistance and adhesiveness, but was insufficient as a feeling of use in actual use. I found it.

In view of the above, the above-mentioned water-resistant adhesive property and bent part adhesive property,
As a result of extensive investigations with the aim of providing an emergency plaster with a good feeling of use even when applied to weak skin parts, while maintaining some degree of adhesive residue prevention and skin non-irritating properties, adhesive By further specifying the mixing ratio of the organosiloxane polymer which is a constituent material of the above and the acrylic polymer containing alkyl (meth) acrylate as a main component, the strong adhesion of the organosiloxane polymer and the tackiness of the acrylic polymer can be improved. The present inventors have found that the feeling can be improved and the pain at the time of peeling can be reduced.

[0008]

That is, the first-aid bandage according to the present invention is a first-aid bandage provided with a liquid-absorbing pad in a central area of a surface of a pressure-sensitive adhesive layer laminated on one side of a support. Wherein the pressure-sensitive adhesive layer comprises an organosiloxane-based polymer and an acrylic polymer having an alkyl (meth) acrylate as a main component in a weight ratio of 5:95 to 1: 1.
It is characterized by having a content of 9:81 and having a micro-layer separation structure.

At this time, the acrylic polymer is
It is preferably formed from a copolymer of an alkyl (meth) acrylate and a functional monomer.

Alternatively, in the present invention, the organosiloxane polymer and the acrylic polymer are
It is preferred to contain them in a weight ratio of 5:95 to 14:86.

Further, according to the present invention, as the support,
It is convenient to use a polyester-based polyurethane film or a polyether-based polyurethane film.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, an adhesive tape for applying a skin comprising a support and a pressure-sensitive adhesive layer laminated on one side of a support is used in the emergency bandage of the present invention. The support used for the pressure-sensitive adhesive tape has a pressure-sensitive adhesive layer described later laminated and held on one side with good anchoring properties. Specific materials for the support include polystyrene-based thermoplastic elastomer films, polyethylene, polypropylene, ethylene / methacrylic acid copolymer, ethylene /
Polyolefin films such as methyl methacrylate,
Polyurethane films such as ether-based and ester-based films, polyester-based films, woven and nonwoven fabrics made of various plastic materials, knitted fabrics, papers, laminates of these films, laminates of fabrics and papers, films and fabrics And the like can be used.

The thickness of the support to be used is optional depending on the material.
To 250 μm, preferably about 30 to 100 μm,
When a support such as a woven or non-woven fabric or paper is used, the thickness is about 50 to 500 μm, preferably about 100 to 300 μm. In addition, when cloth or paper is used as the support material as in the latter case, it is difficult to measure the absolute thickness.
It is preferable to use one of about 200 g / m ² .

[0014] Among these supports, temperature sensitivity (characteristic change is small with temperature change), flexibility (skin followability),
Polyurethane-based films are preferable from the viewpoint of appropriate moisture permeability, tensile strength, and the like, and it is particularly preferable to use polyester-based polyurethane films and polyether-based polyurethane.

In the present invention, the pressure-sensitive adhesive layer laminated on one surface of the support and in contact with and in contact with the skin surface is formed from a mixture of an organosiloxane polymer and an acrylic polymer containing (meth) acrylate as a main component. Is done. These ratios are preferably 5:95 to 19:81 by weight or 5:95 to 14:86 by weight. When the amount of the organosiloxane polymer is larger than that (when the amount of the acrylic polymer is too small), the adhesion to the skin surface for a long time and the water resistance are improved, but the tackiness at the time of application is poor, and at the time of peeling. Pain becomes stronger.

On the other hand, when the amount of the organosiloxane polymer is less than this (when the amount of the acrylic polymer is too large), the effect of adding the organosiloxane polymer cannot be exerted, and the adhesiveness cannot be maintained for a long time. However, when it is processed into an emergency bandage, it falls off immediately and has poor water resistance.

As described above, according to the present invention, Japanese Patent Application Laid-Open No. 9-206
By making the ratio of the organosiloxane polymer smaller than that disclosed in US Pat.
The present invention is characterized in that the tackiness is further improved, the resistance at the time of peeling is reduced, and the pain at the time of peeling is further alleviated.

The organosiloxane-based polymer used in the pressure-sensitive adhesive has a surface tension that is specifically lower than other polymers, and improves the adhesion to the surface of the skin to be adhered. The organosiloxane polymer in the present invention is a polymer that can be used as an adhesive.Specifically, an organosiloxane rubber component and a silicone resin are dehydrated and condensed with silanol groups in the presence of a condensation catalyst. Polymer is used.

As the organosiloxane rubber component, dimethylpolysiloxane having a weight average molecular weight of about 150,000 to 1.5 million, preferably about 200,000 to 1,000,000 can be used. Those substituted with a phenyl group or a vinyl group can be suitably used. Typically, PSA6 manufactured by General Electric
A mutual condensate of a mixture of an alkylaryl polysiloxane raw rubber represented by 574 or the like and an organosiloxane resin can be used.

As the silicone resin, those having a three-dimensional structure comprising a monofunctional siloxane unit and a tetrafunctional siloxane unit can be used, and have a function of imparting a sticky feeling. Usually, a weight average molecular weight of 1,000 to 30,000
0, preferably about 3,000 to 10,000 can be used.

The acrylic polymer contained together with the above-mentioned organosiloxane polymer as a component constituting the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape for skin application can impart sufficient initial tackiness (tackiness) to the pressure-sensitive adhesive layer and can be used at the time of peeling. Prevents glue residue and exerts a function as a filler by containing a cross-linked acrylic polymer, and contains alkyl (meth) acrylate as a main component, which is relatively easy to adjust adhesive properties. Use something. Preferably, a pressure-sensitive adhesive obtained by copolymerizing an alkyl acrylate or an alkyl methacrylate (hereinafter, referred to as an alkyl (meth) acrylate) as a main component monomer with another copolymerizable monomer is preferably used. Is preferred.

As the alkyl (meth) acrylate, specifically, the alkyl group is butyl, pentyl,
It has a straight-chain alkyl group or a branched alkyl group having 4 to 13 carbon atoms such as hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, etc. (meth)
Acrylic acid alkyl esters can be used, and one or more of these can be used.

The alkyl (meth) acrylate is not limited to the above examples, but may have 1 to 1 carbon atoms as long as the adhesive properties are not significantly reduced.
An alkyl (meth) acrylate having a lower alkyl group of 3 or an alkyl (meth) acrylate having a higher alkyl group having 14 or more carbon atoms may be used in combination.

The copolymerizable monomer which can be copolymerized with the above-mentioned alkyl (meth) acrylate includes at least one unsaturated double bond involved in the copolymerization reaction in the molecule and a carboxyl group ( For example, (meth) acrylic acid, itaconic acid, maleic acid, maleic anhydride, etc., a hydroxyl group (eg, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate), a sulfoxyl group (eg, styrene sulfonic acid) , Allylsulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxynaphthalenesulfonic acid, acrylamidomethylpropanesulfonic acid, etc., amino group (for example, aminoethyl (meth) acrylate, dimethyl (meth) acrylate) amino Ethyl ester, (meth) acrylic acid tert-butylaminoethyl ester, etc.),
Amide group (for example, (meth) acrylamide, dimethyl (meth) acrylamide, N-methylolpropane (meth) acrylamide, etc.), alkoxyl group (for example, (meth) acrylic acid methoxyethyl ester, (meth)
Ethoxyethyl acrylate, methoxyethylene glycol (meth) acrylate, methoxydiethylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate
Such a monomer having a functional group in the side chain can be used. Other monomers that can be copolymerized include, for example, (meth) acrylonitrile, vinyl acetate, vinyl propionate, N-vinyl-2-pyrrolidone, methylvinylpyrrolidone, vinylpyrrolidone, vinylpiperidone,
Vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl caprolactam, vinyl oxazole, vinyl morpholine, and the like can be used.

These copolymerizable monomers (functional monomers) can be copolymerized by one kind or two or more kinds. However, adhesiveness and cohesiveness as adhesive properties, and crosslinking of the adhesive layer if necessary. From the viewpoint of reactivity at the time of treatment, it is particularly preferable that at least one of a carboxyl group-containing monomer and a hydroxyl group-containing monomer be an essential component and other monomers exemplified above are copolymerized as necessary. The copolymerization amount of the copolymerizable monomer can be arbitrarily set so as to be 50% by weight or less, preferably 2 to 40% by weight, based on the total amount of the monomers including the alkyl (meth) acrylate.

The pressure-sensitive adhesive layer used in the present invention is a mixture of the above two types of pressure-sensitive adhesive polymers. However, depending on the mixing ratio, the pressure-sensitive adhesive layer is inferior in cohesiveness and causes cohesive failure when peeled from the skin surface. There is fear. Therefore, in order to improve the mechanical strength of the pressure-sensitive adhesive layer, it is preferable to subject the pressure-sensitive adhesive layer to a crosslinking treatment as necessary.

As a crosslinking method, physical crosslinking by irradiation such as ultraviolet irradiation or electron beam irradiation, isocyanate compound, organic peroxide, organic metal salt, metal alcoholate, metal chelate compound, polyfunctional compound (polyfunctional compound) Cross-linking treatment using a cross-linking agent such as a functional external cross-linking agent or a polyfunctional internal cross-linking monomer such as diacrylate or dimethacrylate). Among these cross-linking treatments, it is preferable to perform an external cross-linking agent treatment using an isocyanate-based compound such as a trifunctional isocyanate from the viewpoints of easy adjustment of the cross-linking reactivity and the degree of cross-linking, and handling. The amount of these crosslinking agents is 100% of the solid content of the pressure-sensitive adhesive layer.
It is about 0.01 to 1.0 part by weight based on part by weight.

The pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet for skin application used in the emergency bandage of the present invention has the above-mentioned structure. An acrylic polymer having both hydrophilic properties is mixed. Therefore,
These polymers are not completely compatible with each other, and the pressure-sensitive adhesive layer has a micro-layer separation structure.

The state of the micro-layer separation structure varies depending on the type of the organosiloxane polymer or acrylic polymer used. However, since the ratio of the organosiloxane polymer / acrylic polymer is less than 1/2, the present invention In the case of the pressure-sensitive adhesive layer, a clear layer separation structure can be obtained. In this case, the acrylic polymer becomes the continuous phase matrix (sea), and the domain (island) in which the organosiloxane polymer is dispersed in the matrix.
Has a microdomain structure (sea-island structure). In this case, the properties of the acrylic polymer are strongly exhibited, and the properties of the organosiloxane polymer are added in a reinforcing manner, so that the initial tackiness and the prevention of adhesive residue upon peeling are excellent. In the present invention,
It is thought that as a result of a smaller ratio of the organosiloxane polymer / acrylic polymer, the tackiness of the acrylic polymer is further improved, and the pain at the time of peeling is further alleviated.

In the present invention, the pressure-sensitive adhesive layer having a specific composition and a microstructure is laminated on one side of the support as described above, but the printing is performed on all or a part of the exposed surface of the support. Processing can be performed. The printing layer formed by the printing process can improve the abrasion resistance of the surface of the support and the slipperiness. In other words, if the slipperiness is poor, the end of the sheet is likely to be turned (peeled off) due to the rubbing with clothes or the like during use by sticking to the skin surface. Therefore, these drawbacks can be eliminated by forming the printing layer on the exposed surface of the support by heat fusion or coating.

The printing layer can be made of an acrylic resin, a butyral resin, a polyvinyl chloride resin, a vinyl chloride / vinyl acetate copolymer resin, ethyl cellulose, polyurethane or the like as a main component. For this purpose, it is preferable to apply a silicone-based or fluorine-based water-repellent agent on the printed layer after forming it.

Further, when a film made of a material having no moisture permeability is used as the support in the present invention, if the film is applied to the skin surface for a long time, the applied portion may become moist, resulting in skin irritation and the like. There is. Therefore, even when such a support is used or when a support having moisture permeability is used, it is preferable to perforate the support and the pressure-sensitive adhesive layer in order to further impart moisture permeability. To perform the perforation processing, a method using a perforation roll, a method such as punching or laser irradiation can be used, and the hole diameter is about 0.2 to 2 mm.

The emergency bandage of the present invention is obtained by providing a liquid-absorbent pad in substantially the center area of the surface of the pressure-sensitive adhesive layer of the thus obtained pressure-sensitive adhesive sheet for application to the skin. As the liquid-absorbing pad, a conventionally known pad is used. As the liquid absorbing pad, for example, a gauze, a woven fabric, a nonwoven fabric, a composite product of absorbent cotton and nonwoven fabric, a composite product of absorbent cotton and a knitted net can be used.

The size of the pressure-sensitive adhesive sheet is also different depending on the size of the pressure-sensitive adhesive sheet to be used as the base material layer. It is preferable to adjust the size to such a value.

In the emergency bandage of the present invention, in order to prevent contamination of the surface of the pressure-sensitive adhesive layer, it is preferable to coat the surface of the pressure-sensitive adhesive layer with a separator until use. In this case, it is preferable to use a separator using a silicone-based release agent in order to improve the releasability from the pressure-sensitive adhesive layer containing the organosiloxane-based polymer.

[0036]

EXAMPLES Examples of the present invention will be shown below, and will be described more specifically. Hereinafter, "parts" in the text means "parts by weight".
And "%" means "% by weight".

(Example 1) 60 parts of 2-ethylhexyl acrylate and isooctyl acrylate 3
6 parts and 4 parts of acrylic acid were charged into a reaction vessel together with ethyl acetate as a polymerization solvent, and a polymerization reaction was carried out by a conventional method in the presence of 0.3 parts of benzoyl peroxide as a polymerization initiator to obtain an acrylic polymer. . The solid concentration of the obtained acrylic polymer was 35% by weight.

On the other hand, organosiloxane polymers include PSA65 (trade name, manufactured by General Electric).
74 was used.

Next, the organosiloxane polymer and the acrylic polymer were mixed at a solid content ratio of 15:85, and the pressure-sensitive adhesive solution having a solid concentration of 30% was adjusted with toluene.

The pressure-sensitive adhesive solution thus obtained is applied to a release-treated surface of a separator, one surface of which is treated with a silicone-based release agent, so that the thickness after drying is 30 μm, and the pressure-sensitive adhesive is dried. A layer was formed. Next, a polyether-based polyurethane film was adhered to the upper surface of the pressure-sensitive adhesive layer obtained above to obtain a pressure-sensitive adhesive sheet for skin application.

This pressure-sensitive adhesive sheet for applying to the skin was 19 mm × 7
Cut to a size of 2 mm, 15
A gauze pad having a size of mm × 20 mm was provided to obtain an emergency bandage of Example 1.

Example 2 The procedure of Example 2 was repeated except that the ratio of the organosiloxane polymer to the acrylic polymer blended in Example 1 was changed to a solid content ratio of 5:95. I got an emergency bandage.

Comparative Example 1 An emergency plaster of Comparative Example 1 was obtained in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was formed of only an acrylic polymer.

Comparative Example 2 The emergency bandage of Comparative Example 2 was prepared in the same manner as in Example 1 except that the ratio of the organosiloxane polymer to the acrylic polymer was changed to a solid content ratio of 70:30. Obtained.

Example 3 90 parts of isononyl acrylate, 5 parts of butyl acrylate and 5 parts of acrylic acid were charged into a reaction vessel together with ethyl acetate as a polymerization solvent, and benzoyl peroxide 0.1 part was used as a polymerization initiator. A polymerization reaction was carried out in the presence of 3 parts by a conventional method to obtain an acrylic polymer. The solid concentration of the obtained acrylic polymer was 35% by weight.

On the other hand, organosiloxane polymers include PSA65 (trade name, manufactured by General Electric).
74 was used.

Next, the organosiloxane polymer and the acrylic polymer were mixed at a solid content ratio of 19:81, and the pressure-sensitive adhesive solution having a solid concentration of 30% was adjusted with toluene.

The pressure-sensitive adhesive solution obtained as described above is applied to a release-treated surface of a separator having one surface treated with a silicone-based release agent so that the thickness after drying is 30 μm, and dried to obtain a pressure-sensitive adhesive. A layer was formed. Next, a polyethylene-based polyolefin film was bonded to the upper surface of the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive sheet for applying to the skin.

The pressure-sensitive adhesive sheet for applying to the skin was 19 mm × 7
Cut to a size of 2 mm, 15
A gauze pad having a size of mm × 20 mm was provided to obtain an emergency bandage of Example 3.

Comparative Example 3 A rubber-based pressure-sensitive adhesive containing 50 parts of natural rubber, 100 parts of terpene resin and 35 parts of polybutene as main components was prepared, and the solid content concentration was 30% by weight with toluene.
Was adjusted.

The pressure-sensitive adhesive solution obtained in this way was
One side of a soft vinyl chloride film having a thickness of 0 μm was coated so as to have a thickness of 35 μm after drying, and dried to obtain a pressure-sensitive adhesive sheet for skin application.

This pressure-sensitive adhesive sheet for applying to the skin was 19 mm × 7
Cut to a size of 2 mm, 15
A gauze pad of mm × 20 mm was provided to obtain an emergency bandage of Comparative Example 3.

[Comparative Test] The first-aid bandage obtained in each of the above Examples and Comparative Examples was wrapped around the second joint of the index finger of 15 healthy persons and applied flat on the inner side of the upper arm (a rash-prone area), followed by skin adhesion. Properties, water resistance, pain when peeling, adhesive residue,
Unevenness and skin irritation were evaluated according to the criteria shown in Table 1, and the results are shown in Table 1. In addition, the sticking time was set to 8 hours and daily water work was performed for evaluation.

[0054]

[Table 1]

As can be seen from Table 1, the first-aid bandage of the present invention exhibited less or less pain and skin irritation while having the same or higher skin adhesiveness than the comparative examples. In particular, even when a pressure-sensitive adhesive layer composed of an organosiloxane-based polymer and an acrylic polymer was used, it was confirmed that pain was significantly reduced as compared with a case where a large amount of the organosiloxane-based polymer was blended (Comparative Example 2). . Also, it was confirmed that the adhesive residue at the time of peeling was small, and good water resistance was obtained.

[0056]

As described above, in the first-aid bandage of the present invention, an adhesive obtained by mixing an organosiloxane polymer and an acrylic polymer at a specific ratio so that the former ratio is relatively low. Since the agent layer is used and the mixed state is a micro-layer separation structure, it has excellent initial adhesion to the skin surface and long-term adhesion (adhesion), as well as water resistance and adhesion to bent parts, It is excellent in prevention of glue residue and non-irritating property of the skin. In particular, since the organosiloxane polymer is relatively low, the tackiness at the time of sticking is further improved, and the pain at the time of peeling can be reduced. In particular, it can be used even on a weak part of the skin such as the inner arm without worrying about the damage at the time of peeling, and the properties of the pressure-sensitive adhesive layer can be maximized.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takashi Kinoshita 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Inventor Oka Keiko 1008 Terashiri, Hino-cho, Gamo-gun, Shiga Prefecture Toyo F term in Chemical Co., Ltd. (reference) 4C081 AA03 AA12 BA17 BB01 BB04 BB09 CA021 CA031 CA081 CA082 CA161 CA211 CA221 CA272 CB042 CB051 CC01 DA02 DC02 DC04 DC05 DC06 DC12

Claims (4)

[Claims] 1. An emergency bandage having a liquid-absorbent pad provided in a central region of the surface of a pressure-sensitive adhesive layer for skin application laminated on one surface of a support, wherein the pressure-sensitive adhesive layer comprises an organosiloxane-based polymer and ( An emergency plaster comprising an acrylic polymer mainly composed of alkyl (meth) acrylate at a weight ratio of 5:95 to 19:81, and having a micro-layer separation structure. 2. The emergency bandage according to claim 1, wherein the acrylic polymer is formed from a copolymer of an alkyl (meth) acrylate and a functional monomer. 3. The pressure-sensitive adhesive layer comprises an organosiloxane polymer and the acrylic polymer in a weight ratio of 5: 9.
3. The emergency bandage according to claim 1, wherein the bandage is contained in a ratio of 5 to 14:86. 4. The first-aid bandage according to claim 1, wherein the support is a polyester-based polyurethane film or a polyether-based polyurethane film.